I've just taken apart a defunct 24 hour timer in case it contained anything of use. The fault was mechanical, not electrical. It has a crude little field wound motor and many tiny gears. This is a mains device with a dropper resistor which, if I remember correctly my
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has a value of 47k ohms. How much will this reduce the voltage? I've tried it on 12 volts, and it just twitches a bit. Lots and lots of very fine copper windings, so I suppose I can try unravelling some until it does work.